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Effects of four isocyanates and four plasticizers on the thermomechanical and tensile properties of hydroxyl‐terminated polybutadiene elastomers and the effect of solid particle filling
Author(s) -
Seyidoglu Tijen,
Bohn Manfred A.
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50362
Subject(s) - plasticizer , hydroxyl terminated polybutadiene , polybutadiene , materials science , elastomer , ammonium perchlorate , ultimate tensile strength , composite material , polyurethane , particle (ecology) , particle size , polymer chemistry , dynamic mechanical analysis , polymer , chemistry , copolymer , composite number , oceanography , geology
Abstract The aim of this study is to analyze effect of four different isocyanates and four different plasticizers in hydroxyl‐terminated polybutadiene (HTPB) based elastomers by quantitative analysis of the shape of the loss factor (tan δ ), tensile strength, deformation frequency shift of the maximum temperatures of loss moduli G" and of tan δ . The first part of the study shows intensities of the tan δ curves with the four isocyanates follow the order HDI > IPDI > H12MDI > Desmodur™ E305. By molecular modeling of the isocyanates and the corresponding polyurethane parts the influence of molecular geometry on tan δ are discussed. The second part of the study analyzes HTPB‐IPDI elastomers with the four different plasticizers DOA, DOS, DOZ, and IDP. The IDP provides lowest T g at about −83°C, while the others provide at about −78°C. In the third part, aluminum (Al‐18 μm) and ammonium perchlorate (AP‐200 μm) are added to HTPB‐IPDI+DOA to analyze the effect of particle size, wt% content and particle type on the shape and intensity of the tan δ curves. From the frequency shift of the two maximum temperatures one receives activation energies Eaf. Their average values without and with plasticizer are with tan δ 178 and 165 kJ/mol and with G" 274 and 248 kJ/mol, respectively.